[regexp] Port RegExpExecStub to CSA (mostly)

src/interface-descriptors.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include <memory>
 
 #include "src/assembler.h"
@@ skipping 627 matching lines @@
   DEFINE_PARAMETERS(kTarget, kActualArgumentsCount, kSlot)
   DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(CallICTrampolineDescriptor,
                                                CallInterfaceDescriptor)
 };
 
 class CallConstructDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(CallConstructDescriptor, CallInterfaceDescriptor)
 };
 
 class RegExpExecDescriptor : public CallInterfaceDescriptor {

[Igor Sheludko, 2017/03/15 00:39:04]

IrregexpExecDescriptor or something...

[jgruber, 2017/03/15 13:43:44]

Left as-is for now since we'll remove this soon.

  public:
-  DEFINE_PARAMETERS(kRegExpObject, kString, kPreviousIndex, kLastMatchInfo)
-  DECLARE_DESCRIPTOR_WITH_STACK_ARGS(RegExpExecDescriptor,
-                                     CallInterfaceDescriptor)
+  DEFINE_PARAMETERS(kString, kLastIndex, kStringStart, kStringEnd, kCode)
+  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(RegExpExecDescriptor,
+                                               CallInterfaceDescriptor)
+
+  static const Register StringRegister();
+  static const Register LastIndexRegister();
+  static const Register StringStartRegister();
+  static const Register StringEndRegister();
+  static const Register CodeRegister();
 };
 
 class RegExpReplaceDescriptor : public CallInterfaceDescriptor {
  public:
   DEFINE_PARAMETERS(kReceiver, kString, kReplaceValue)
   DECLARE_DEFAULT_DESCRIPTOR(RegExpReplaceDescriptor, CallInterfaceDescriptor,
                              kParameterCount)
 };
 
 class RegExpSplitDescriptor : public CallInterfaceDescriptor {
@@ skipping 312 matching lines @@
 }  // namespace v8
 
 
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_